could effervesce
Verbo regular: effervesce - effervesced- effervesced

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could effervesce
you could effervesce
he could effervesce
we could effervesce
you could effervesce
they could effervesce 	I could be effervescing
you could be effervescing
he could be effervescing
we could be effervescing
you could be effervescing
they could be effervescing	I could have effervesced
you could have effervesced
he could have effervesced
we could have effervesced
you could have effervesced
they could have effervesced	I could have been effervescing
you could have been effervescing
he could have been effervescing
we could have been effervescing
you could have been effervescing
they could have been effervescing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't effervesce
you couldn't effervesce
he couldn't effervesce
we couldn't effervesce
you couldn't effervesce
they couldn't effervesce 	I couldn't be effervescing
you couldn't be effervescing
he couldn't be effervescing
we couldn't be effervescing
you couldn't be effervescing
they couldn't be effervescing	I couldn't have effervesced
you couldn't have effervesced
he couldn't have effervesced
we couldn't have effervesced
you couldn't have effervesced
they couldn't have effervesced	I couldn't have been effervescing
you couldn't have been effervescing
he couldn't have been effervescing
we couldn't have been effervescing
you couldn't have been effervescing
they couldn't have been effervescing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I effervesce?
could you effervesce?
could he effervesce?
could we effervesce?
could you effervesce?
could they effervesce? 	could I be effervescing?
could you be effervescing?
could he be effervescing?
could we be effervescing?
could you be effervescing?
could they be effervescing? 	could I have effervesced?
could you have effervesced?
could he have effervesced?
could we have effervesced?
could you have effervesced?
could they have effervesced? 	could I have been effervescing?
could you have been effervescing?
could he have been effervescing?
could we have been effervescing?
could you have been effervescing?
could they have been effervescing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I effervesce?
couldn't you effervesce?
couldn't he effervesce?
couldn't we effervesce?
couldn't you effervesce?
couldn't they effervesce? 	couldn't I be effervescing?
couldn't you be effervescing?
couldn't he be effervescing?
couldn't we be effervescing?
couldn't you be effervescing?
couldn't they be effervescing? 	couldn't I have effervesced?
couldn't you have effervesced?
couldn't he have effervesced?
couldn't we have effervesced?
couldn't you have effervesced?
couldn't they have effervesced? 	couldn't I have been effervescing?
couldn't you have been effervescing?
couldn't he have been effervescing?
couldn't we have been effervescing?
couldn't you have been effervescing?
couldn't they have been effervescing?